That Sworks 350 looks intresting. Different layout from their full-on racing kit, but the front suspension looks the same. Layout is very much like the serpent/teamC - but neither of those use pillow balls up front.
Personally, if I was going to race 80-100% of the time, and was on a budget, I would look for a used Losi 3.0, or a used Tekno EB8.3 Total budget would be close to, but a bit higher than either of these RTR's, and you would have a better racer.
But if I had to choose between those two RTR's, well, I already own a Typhon!
Edit -
Electronics has to be changed in both cases to be more competitive.
Define Competitive? middle of the B main in a 3 heat club race? Or middle of the A main at the Roar Southern nationals? First case is doable with either car with stock electronics. For Club level racing, driving consistently is more important than anything - Slower is faster. Once you try to go to big regional races, no RTR chassis will cut it.
Best tip ever - go to your local track that you will be racing at. Walk the pits, chat with folks, tell them you want to start racing on a budget (no $1000 kits). See what they run. First time I did this, I had three guys offer to sell me their cars, because they wanted to upgrade. 2 of those were smoking deals on good chassis too.
If you can find a kit that other racers also run, then you can sponge tuning tips off them on race day - this will help you climb the ladder quicker...
jerry